A bent spring metal washer with a centrally located hole. It is designed to exert pressure axially when assembled in place.
NSN 5910-00-308-9733
NSN 5998-01-359-4039
NSN 5996-00-413-0878
NSN 5920-00-072-1492
NSN 6220-01-501-7907
NSN 5920-01-076-2679
NSN 6240-01-569-4482
NSN 6220-01-419-1200
NSN 7035-01-588-4459
NSN 5930-01-248-2235
NSN 5960-00-960-6805
NSN 5996-01-457-6118